How do I link an array between two ViewControllers? - ios

Question

I'm a beginner at C# so make sure you explain everything.
Okay, so I have a UIPickerView with its corresponding array of items in my ViewController. When the user clicks "submit", the app is supposed to take them to a SecondViewController, and display the item that they chose in the UIPickerView in a label. The only problem I am having is that I can't seem to link the two ViewControllers together.
I imported my ViewController by using #import into the SecondViewController, but that didn't work. I am getting a "use of undeclared identifer' error. What am I supposed to do to link the two ViewControllers together?
Thanks in advance.

Answer 1

If your first ViewController is the one that's presenting your second ViewController, then you can add a property in the second-view-controller that will be set to the selected value.
In SecondViewController.h
#property (nonatomic) NSString *selectedItemName;
Then, when you're presenting your second-view-controller, also set the value for this property:
SecondViewController *vc2 = [[SecondViewController alloc] init];
vc2.selectedItemName = #"selected item"; //set the actual selected item's value here
[self presentViewController:vc2 animated:YES];

Answer 2

Refer to this answer by Parth Bhatt. I think that should help you:
Passing NSString value between classes
I am re-pasting the answer to make the answer useful in case the link goes off in the future.
Answer from the above link:
Let us use the names of the two viewControllers as FirstViewController and SecondViewController.
Now suppose you push SecondViewController from FirstViewController on a button click then you need to write this code under your button click event:
// In the FirstViewController
- (void)buttonClicked:(id)sender{
SecondViewController *second = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle: nil];
second.secString = firstString;
[self.navigationController pushViewController:second animated:YES];
[second release];
}
Here you need to declare in SecondViewController.h file:
NSString *secString;
and then create a #property
#property (non atomic,strong) NSString *secString;
In SecondViewController.m you need to #synthesize the secString:
#synthesize secString;
Hence this way you also create a getter and setter for secString by creating property and synthesizing it.
Now you can easily access the secString and you can use it anywhere in SecondViewController.
Just to check Try and check if value of firstString is passed to secString, write following code on viewWillAppear: of SecondViewController
NSLog(#"secString: %#",secString);
Let me know if you need more help.
Hope this helps.